power adapter is just RM299
i see no reason go for OEM

battery well, cost quite a bit
still this thing has to be original

but, how about product from Sonnet?

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Added on November 4, 2009, 10:48 pmjust found out sonnet dont have replacement battery for mac

This post has been edited by cRazYee: Nov 4 2009, 10:48 PM

the so called OEM charger cost how much

Wanna know why? Cuz some country simply don't need grounding. US, Japan and etc
Socket switch is a big thing to them

It's uk, malaysia running 230v that need it.

The adapter is designed to be universal

I can tell u in uk. I never have static problem

I can tell you, in uk, there is no need of proper metal
Contact grounding pin

It's all down to the country electrical system.
Not apple fault

Japan and state are using 110-120v
This is the main reason. But I not sure the main detail either

This post has been edited by cRazYee: Dec 22 2012, 06:36 PM

Best answer for you perhaps
http://wiki.answers.com/Q/What_is_the_main...language_please

"We usually get our electric power in DC or AC form. DC is constant voltage such as a batter output and is useful for most low power (think less than 100 watt light bulb) applications. The power coming from a normal home outlet is AC (alternating current) and swings back and forth from about 155V to -155V in a sine wave pattern 60 times per second (50 times per second in some countries). The average voltage (RMS) is 110V in USA. AC is useful because you can convert it to higher and lower voltages with a simple device called a transformer which makes it easier to send across large distances.

1 Phase is what is described above - it is your basic 110V outlet.

2 Phase is what goes into a home fuse box. It is two wires each carrying 110V with respect to ground but they are "out of phase" meaning when one sine wave reaches +155V, the other reaches -155V at the same moment. If you have a device that needs 220V AC (such as a stove or dryer) you can skip the ground and use the 2 110V 2-Phase wires.

3 Phase has 3 wires carrying power (a 4th wire has ground). The voltages on the 3 wires with respect to ground each look like a normal sine wave at 110V but the peaks of the sine waves are delayed evenly so that wire 1 peaks, then wire 2, then wire 3, then back to wire 1 in equally timed spacing. This is called 120 degree phase between any 2 wires. This is the power coming out of power plants. 3 Phase is easy to use or create with generators and motors. 3 Phase was chosen because it needs less copper to carry power long distances. Modern technologies (transistors) can be very efficient with converting DC voltages now but when the power grid system was created we mostly only had transformers and wires.

3 Phase can be found on most (but not all!) streets in America If you look at power lines, the topmost lines are the highest voltage. Usually there are 3 (each carrying 1 of the 3 phases). These are the most dangerous. Then every 10 houses or so you see a transformer that taps off one of these to create the 2 phase for homes. As the power gets down a remote area often the topmost lines branch apart and you only have one going down a particular street.
"

to be honest, i learn this before, just forget the details of them

or this one
http://en.wikipedia.org/wiki/AC_power_plugs_and_sockets

basically it's down to the standard of country. Malaysia Standard (might) not enforce proper grounding in every building (maybe has been done in new built area)

quote:
"Japan also uses a grounded plug similar to the North American NEMA 5-15.[39] However, it is less common than its NEMA 1-15 equivalent. Since 2005, new Japanese homes are required to have class I grounded outlets for connecting domestic appliances. This rule does not apply for the outlets not intended to be used for domestic appliances, but it is strongly advised to have class I outlets throughout the home."

So basically, the socket itself is grounded, and there are running 2 phase